1
COMEDK 2023 Morning Shift
MCQ (Single Correct Answer)
+1
-0

A string vibrates with a frequency of $$200 \mathrm{~Hz}$$. When its length is doubled and tension is altered, it begins to vibrate with a frequency of $$300 \mathrm{~Hz}$$. The ratio of the new tension to the original tension is

A
9 : 1
B
1 : 9
C
3 : 1
D
1 : 3
2
COMEDK 2023 Evening Shift
MCQ (Single Correct Answer)
+1
-0

Two open organ pipes A and B of length $$22 \mathrm{~cm}$$ and $$22.5 \mathrm{~cm}$$ respectively produce 2 beats per sec when sounded together. The frequency of the shorter pipe is

A
92 Hz
B
90 Hz
C
88 Hz
D
86 Hz
3
COMEDK 2022
MCQ (Single Correct Answer)
+1
-0

A bat emitting an ultrasonic wave of frequency 4.5 $$\times$$ 104 Hz at speed of 6 m/s between two parallel walls. The two frequencies heard by the bat will be

A
4.67 $$\times$$ 104 Hz, 4.34 $$\times$$ 104 Hz
B
4.34 $$\times$$ 104 Hz, 4.67 $$\times$$ 104 Hz
C
4.5 $$\times$$ 104 Hz, 5.4 $$\times$$ 104 Hz
D
4.67 $$\times$$ 103 Hz, 4.34 $$\times$$ 103 Hz
4
COMEDK 2022
MCQ (Single Correct Answer)
+1
-0

A source of sound emits sound waves at frequency $$f_0$$. It is moving towards an observer with fixed speed $${v_s}$$ ($${v_s},v$$, where $$v$$ is the speed of sound in air.) If the observers were to move towards the source with speed $$v_0$$, one of the following two graphs (A and B) will give the correct variation of the frequency $$f$$ heard by the observer as $$v_0$$ is changed.

COMEDK 2022 Physics - Waves Question 7 English

The variation of $$f$$ with $$v_0$$ is given correctly by

A
graph A with slope $$ = {{{f_0}} \over {(v + {v_s})}}$$
B
graph B with slope $$ = {{{f_0}} \over {(v - {v_s})}}$$
C
graph A with slope $$ = {{{f_0}} \over {(v - {v_s})}}$$
D
graph B with slope $$ = {{{f_0}} \over {(v + {v_s})}}$$
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